An EVM-compatible testnet for the Cycle Network, Jellyfish (Chain ID 1223) uses ETH for gas and enables low-cost smart contract experimentation and dApp testing.
Cycle Network Testnet Jellyfish is the public testing environment for Cycle Network that uses ETH as the native gas token. It’s designed for developers to trial cross-chain bridges, wallets, and dApps end-to-end—covering contract deployment, relayer flows, and monitoring—before mainnet releases.
It stands out by making cross-chain workflows first-class—native ETH gas, streamlined bridge/messaging tooling, and ready-to-use developer infrastructure (faucets, RPCs, explorers) tailored for interoperability testing. Key performance notes as of Sep 24, 2025: average gas cost is effectively $0 in USD terms (testnet ETH); official block speed, TPS, and on-chain activity metrics are not published and can vary with load, so benchmark and compare via the explorer linked from cyclenetwork.io.
Cycle Network Testnet Jellyfish uses ETH as the gas token for transaction fees. You can obtain ETH by bridging from other chains or purchasing using thirdweb Bridge, or through faucets (for testnet).
To bridge ETH to Cycle Network Testnet Jellyfish, connect your wallet to thirdweb bridge, select your source chain, choose the token you want to bridge, select Cycle Network Testnet Jellyfish as the destination, enter the amount, and confirm the transaction. The bridge will handle the cross-chain transfer instantly.
To build on Cycle Network Testnet Jellyfish you can use thirdweb, which provides an easy way to build, monetize and scale your apps, games or agents. You can find detailed guides and documentation on https://portal.thirdweb.com to get started quickly.
To add Cycle Network Testnet Jellyfish to your wallet, you can connect your wallet and click on [Add to Wallet] button at the top of the page. Alternatively, you can add the network manually using the RPC URL and chain details and add it to your wallet's network settings.
To send ETH on Cycle Network Testnet Jellyfish, ensure your wallet is connected to the Cycle Network Testnet Jellyfish network, enter the recipient's address, specify the amount of ETH to send, review the gas fee, and confirm the transaction in your wallet.